package com.huasheng.util.freemaker;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.*;
import java.sql.Clob;
import java.sql.SQLException;

/**
 * Base64 和image互转
 */
public class Base64ToImageUtil {

    public static void main(String[] args) {
        String imageStr = getImageStr(new File("D:\\workspace\\intelworkspace\\GitRepository\\ssh_master\\shr-generator\\src\\main\\java\\io\\renren\\utils\\1.jpg"));

        String s = generateImage(imageStr, "D:\\workspace\\intelworkspace\\GitRepository\\ssh_master\\shr-generator\\src\\main\\java\\io\\renren\\utils\\", "2");
    }

    //图片转化成base64字符串
    public static String getImageStr(File file) {
        //将图片文件转化为字节数组字符串，并对其进行Base64编码处理
        InputStream in = null;
        byte[] data = null;
        //读取图片字节数组
        try {
            in = new FileInputStream(file);
            data = new byte[in.available()];
            in.read(data);
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        //对字节数组Base64编码
        BASE64Encoder encoder = new BASE64Encoder();
        return encoder.encode(data);//返回Base64编码过的字节数组字符串
    }


    static Logger logger = LoggerFactory.getLogger(Base64ToImageUtil.class);

    //base64字符串转化成图片
    public static String generateImage(String imgStr, String path, String name) {   //对字节数组字符串进行Base64解码并生成图片
        if (imgStr == null) //图像数据为空
            return null;
        BASE64Decoder decoder = new BASE64Decoder();
        try {
            //Base64解码
            byte[] b = decoder.decodeBuffer(imgStr);
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {//调整异常数据
                    b[i] += 256;
                }
            }
            //生成jpeg图片
            String imgName = name + ".jpg";
            String imgFilePath = path + "/" + imgName;//新生成的图片
            OutputStream out = new FileOutputStream(imgFilePath);
            out.write(b);
            out.flush();
            out.close();

            return imgFilePath;
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }
}
